06/09/2026
📖 ROHHAD Dictionary #2: What does the first “H” mean?
Last time, we looked at RO = Rapid-Onset Obesity.
Now we move to the first H in ROHHAD:
🧠 H = Hypothalamic Dysfunction
The hypothalamus is a small but incredibly important part of the brain. It helps regulate many of the body’s essential functions — often without us even thinking about them.
In ROHHAD, hypothalamic dysfunction can affect several areas of the body, including:
🔹 Hunger and weight regulation
🔹 Hormone production and balance
🔹 Growth and puberty
🔹 Thirst and fluid balance
🔹 Sleep and wakefulness
🔹 Body temperature
This is one of the reasons why ROHHAD can look so different from person to person. The hypothalamus is involved in many systems, and not everyone is affected in exactly the same way.
What may appear to be several separate health problems can actually be connected.
💙 A small part of the brain can have a very big impact on the body.
Understanding hypothalamic dysfunction helps us understand why ROHHAD is so much more than its most visible symptoms.
➡️ Next in our ROHHAD Dictionary:
H = Hypoventilation
Julie Væver